The headline “To catch a liar, just ask them these two questions” oversimplifies a complex topic. There is no pair of questions that can reliably identify every liar. However, psychologists and investigators sometimes look for inconsistencies in a person’s account.
Two useful follow-up questions are:
1. “Can you tell me exactly what happened, step by step?”
Truthful people usually recall genuine experiences as a sequence of events. Someone who is fabricating a story may have more difficulty maintaining a consistent timeline.
2. “Can you tell the story again, starting from a different point?”
For example:
“Start with what happened after lunch and work backward.”
This can make it harder to keep a fabricated story consistent, while truthful memories are often easier to reconstruct from different angles.
What Investigators Actually Look For
Rather than a single “lie detector” question, they may look for:
- Contradictions between different tellings of the story
- Conflicts with known facts or evidence
- Changes in important details over time
- Evasive or overly rehearsed answers
Common Myth: Body Language Reveals Lies
Many people believe that liars always:
- Avoid eye contact
- Fidget
- Look nervous
Research has shown that these behaviors are not reliable indicators of deception. Honest people can be nervous, and confident liars may appear calm.
Important Caveat
Inconsistencies do not automatically mean someone is lying. Memory is imperfect, especially when:
- A lot of time has passed
- The event was stressful
- The person was distracted, tired, or emotional
The best approach is to evaluate the overall pattern of evidence, not to rely on a single question, gesture, or “psychological trick.”
